KR20040041201A - power supply apparatus for motor and controlling method thereof - Google Patents
power supply apparatus for motor and controlling method thereof Download PDFInfo
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- KR20040041201A KR20040041201A KR1020020069168A KR20020069168A KR20040041201A KR 20040041201 A KR20040041201 A KR 20040041201A KR 1020020069168 A KR1020020069168 A KR 1020020069168A KR 20020069168 A KR20020069168 A KR 20020069168A KR 20040041201 A KR20040041201 A KR 20040041201A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/02—Details
- H02P1/022—Security devices, e.g. correct phase sequencing
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- Power Engineering (AREA)
- Computer Security & Cryptography (AREA)
- Rectifiers (AREA)
- Emergency Protection Circuit Devices (AREA)
- Direct Current Feeding And Distribution (AREA)
- Control Of Ac Motors In General (AREA)
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Abstract
Description
본 발명은 모터전원공급장치에 관한 것으로서, 보다 상세하게는 돌입전류방지회로를 갖는 모터전원공급장치 및 모터전원공급방법에 관한 것이다.The present invention relates to a motor power supply device, and more particularly, to a motor power supply device having an inrush current prevention circuit and a motor power supply method.
3상 모터는 삼각형상으로 결선된 코일을 갖는 3상 모터이다. 3상 모터의 전원공급장치는 도 5에 도시된 바와 같이, 모터(117)를 구동하는데 필요한 3상 전압을 얻기 위한 것으로서, 상용교류전원(AC110/220V)을 공급하는 전원공급부(101)와, 교류전원을 정류하는 다이오드정류부(103)와, 초기전원 인가시 돌입전류를 방지하는 돌입전류방지회로(102, 111)와, 다이오드정류부(103)에서 정류된 전압을 평활하는 직류캐패시터(115)와, 직류캐패시터(115)를 과전압으로부터 보호하기 위한 과전압 보호회로(112, 114)와, 직류전원을 다양한 주파수를 갖는 교류전압으로 변환하여 3상 전압을 출력하는 인버터부(116)로 구성된다. 인버터부(116)내에는 PWM(Pulse Width Modulation) 신호를 발생시키는 PWM부(미도시)와 PWM부의 구형파신호에 따라 온오프스위칭되는 다수개의 트랜지스터가 마련된다. 그리고, 모터전원공급장치는 PWM제어신호에 의해 트랜지스터를 온오프시켜 인버터부(116)의 출력을 개폐(ON/OFF)하고 모터의 회전속도 조절을 위해 그 출력 주파수를 조절하는 기능을 하는 도시 않은 마이컴을 갖는다.A three phase motor is a three phase motor with coils triangularly connected. The power supply of the three-phase motor is to obtain a three-phase voltage required to drive the motor 117, as shown in Figure 5, the power supply 101 for supplying a commercial AC power supply (110 / 220V), A diode rectifier 103 for rectifying AC power, an inrush current prevention circuit 102 and 111 for preventing inrush current when an initial power is applied, and a DC capacitor 115 for smoothing the voltage rectified by the diode rectifier 103; And overvoltage protection circuits 112 and 114 for protecting the DC capacitor 115 from overvoltage, and an inverter unit 116 for converting a DC power source into an AC voltage having various frequencies and outputting a three-phase voltage. The inverter unit 116 is provided with a PWM unit (not shown) for generating a pulse width modulation (PWM) signal and a plurality of transistors switched on and off according to a square wave signal of the PWM unit. In addition, the motor power supply device turns the transistor on and off according to a PWM control signal to open / close the output of the inverter unit 116 and adjust its output frequency to adjust the rotational speed of the motor. Have a microcomputer
그런데, 종래의 모터전원공급장치의 돌입전류방지회로는 시스템에 전원을 최초 인가할 때에만 기능을 한다. 즉, 전원이 인가되고 직류캐패시터(115)가 충전된 이후는 그 기능이 회로동작상에 불필요하게 된다. 또한, 과전압보호회로는 그 동작특성상 직류캐패시터(115)의 전압이 안정화(충분히 충전)되어, 모터를 제어할 경우에만 그 기능이 필요로 하게 된다. 즉, 최초 전원 인가 직후에는 그 기능이 필요치 않게 된다. 그러나, 일반적으로 사용되는 돌입전류방지회로에 적용되어야 할 저항 (102; Rs)는 초기 과전류를 막기 위해 용량이 큰 저항이나 써미스터를 사용하게 되고, 직류캐패시터(115)의 용량이 클수록 저항(102; Rs)의 크기가 커지게 되어 회로 설계시 제품의 크기가 커지게 되는 단점이 있다.However, the inrush current prevention circuit of the conventional motor power supply device functions only when power is first applied to the system. That is, after the power is applied and the DC capacitor 115 is charged, the function becomes unnecessary for circuit operation. In addition, the overvoltage protection circuit requires its function only when the voltage of the DC capacitor 115 is stabilized (charged sufficiently) and the motor is controlled. That is, the function is not necessary immediately after the initial power up. However, the resistor 102 (Rs) to be applied to the commonly used inrush current prevention circuit uses a large resistor or thermistor to prevent initial overcurrent, and the larger the capacitance of the DC capacitor 115, the larger the resistor 102; Since the size of Rs) is increased, the size of the product increases in circuit design.
따라서, 본 발명의 목적은, 저항을 돌입방지 및 과전압보호용으로 사용가능하므로 회로설계시 부품 수 및 제조단가를 감소시킬 수 있는 모터전원공급장치 및 모터전원공급방법을 제공하는 것이다.Accordingly, an object of the present invention is to provide a motor power supply device and a motor power supply method which can reduce the number of parts and manufacturing cost in circuit design since the resistance can be used for inrush prevention and overvoltage protection.
도 1은 본 발명에 따른 모터전원공급장치의 회로도,1 is a circuit diagram of a motor power supply according to the present invention;
도 2는 초기 전원공급시 도 1의 모터전원공급장치의 각 접점에서의 전압 및 전류파형도,2 is a waveform diagram of voltage and current at each contact point of the motor power supply of FIG.
도 3은 과전압시 도 1의 모터전원공급장치의 각 접점에서의 전압 및 전류파형도,3 is a voltage and current waveform diagram at each contact point of the motor power supply of FIG.
도 4는 릴레이가 온되는 전압영역 및 스위칭부가 턴온되는 전압영역을 도시한 그래프,4 is a graph illustrating a voltage region in which a relay is turned on and a voltage region in which a switching unit is turned on;
도 5는 종래의 모터전원공급장치의 회로도이다.5 is a circuit diagram of a conventional motor power supply.
* 도면의 주요 부분에 대한 부호의 설명* Explanation of symbols for the main parts of the drawings
1 : AC전원공급부 3 : 다이오드정류회로1: AC power supply 3: diode rectifier circuit
10 : 돌입전류방지 및 과전압보호회로 11 : 2접점 릴레이10: Inrush current prevention and overvoltage protection circuit 11: 2-contact relay
12 : 돌입전류방지저항 13 : 과전압방지다이오드12: Inrush current prevention resistor 13: Overvoltage protection diode
14 : 과전압보호스위칭부 15 : 직류캐패시터14: overvoltage protection switch 15: DC capacitor
16 : 인버터부 17 : AC모터16: inverter 17: AC motor
상기 목적은, 본 발명에 따라, AC전원공급부와, 상기 AC전원공급부의 전원을 정류하는 다이오드정류회로와, 정류된 전원을 평활시키는 직류캐패시터를 갖는 모터전원공급장치에 있어서, 상기 AC전원공급부와 상기 직류캐패시터 사이에 개재되며 상기 직류캐패시터와 접속되는 저항과, 상기 다이오드정류회로와 상기 저항을 병렬 및 직렬로 각각 접속시키는 제1접점 및 제2접점을 갖는 릴레이와, 상기 직류캐패시터의 양단전압을 감지하는 감지부와, 초기 전원인가시 상기 다이오드정류회로와 상기 저항을 직렬로 배치되도록 하고, 상기 직류캐패시터의 양단 전압을 감지하여 소정 크기 이상일 때 상기 다이오드정류회로와 상기 저항을 병렬로 배치되도록 상기 릴레이를 제어하는 제어부를 포함하는 것에 의해 달성된다.According to the present invention, there is provided a motor power supply having an AC power supply, a diode rectifying circuit for rectifying the power of the AC power supply, and a DC capacitor for smoothing the rectified power. A relay interposed between the DC capacitor and having a resistor connected to the DC capacitor, a first contact point and a second contact point connecting the diode rectifying circuit and the resistor in parallel and in series, respectively, and a voltage at both ends of the DC capacitor. The sensing unit and the diode rectifying circuit and the resistor are arranged in series when the initial power is applied, and the diode rectifying circuit and the resistor are arranged in parallel when the voltage between both ends of the DC capacitor is greater than a predetermined size. It is achieved by including a control unit for controlling the relay.
상기 저항과 상기 과전압보호스위칭부의 접점에 접속되는 캐소드와 상기 다이오드정류회로에 접속되는 애노드를 갖는 과전압보호다이오드를 더 포함하는 것이 바람직하다.It is preferable to further include an overvoltage protection diode having a cathode connected to the resistor and the contact of the overvoltage protection switching unit and an anode connected to the diode rectifier circuit.
상기 감지부는 상기 직류캐패시터의 양단전압을 감지하기 위한 비교기를 포함하는 것이 효과적이다.The sensing unit may effectively include a comparator for sensing the voltage across the DC capacitor.
한편, 본 발명의 다른 분야에 따르면, 상기 목적은, AC전원공급부와, 상기 AC전원공급부의 전원을 정류하는 다이오드정류회로와, 정류된 전원을 직류전원으로 변환하는 직류캐패시터와, 상기 다이오드정류회로의 일측단을 저항의 양단 중 어느 하나에 교대로 접속시키는 2접점 릴레이를 갖는 모터전원공급방법에 있어서,최초 전원인가시 상기 직류캐패시터가 충전되도록 상기 다이오드정류회로를 상기 저항과 직렬로 접속시키는 단계와; 상기 직류캐패시터의 양단전압을 감지하는 단계와; 상기 감지된 전압이 소정 크기 이상일 때 상기 다이오드정류회로를 상기 저항을 병렬로 접속시키는 단계를 포함하는 모터전원공급방법에 의해서도 달성될 수 있다.On the other hand, according to another field of the present invention, the object is an AC power supply, a diode rectifying circuit for rectifying the power of the AC power supply, a DC capacitor for converting the rectified power into a DC power, and the diode rectifying circuit A motor power supply method having a two-contact relay for alternately connecting one end of a resistor to one of both ends of a resistor, the method comprising: connecting the diode rectifier circuit in series with the resistor such that the DC capacitor is charged when the power is first applied. Wow; Detecting a voltage across the DC capacitor; It may also be achieved by a motor power supply method comprising connecting the diodes in parallel with the resistor when the sensed voltage is greater than or equal to a predetermined magnitude.
이하에서는 첨부도면을 참조하여 본 발명에 대해 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
도 1은 본 발명에 따른 모터전원공급장치의 회로도이다. 도면에 도시된 바와 같이, AC전원공급부(1)와 접속되는 다이오드정류회로(3)와, 다이오드정류회로(3)와 병렬로 개재되는 저항(12) 및 과전압보호스위칭부(14)와, 다이오드정류회로(3)의 일측단을 저항(12)의 양측단 중 어느 하나에 순차적으로 접속시키는 2접점 릴레이(11)와, 다이오드정류회로(3)의 일측단에 캐소드가 접속되고 저항(12)과 과전압보호스위칭부(14)의 연결접점에 애노드가 접속되는 과전압보호다이오드(13)와, 저항(12)과 과전압보호스위칭부(14)에 병렬로 개재되는 직류캐패시터(15)와, 직류캐패시터(15)에 병렬로 개재되는 인버터부(16)와, 2접점 릴레이(11)의 연결접점을 제어하는 제어부(20)를 갖는다. 여기서, 모터전원공급장치는 직류캐패시터(15)의 양단전압을 감지하여 제어부(20)에 제공하는 감지부(미도시)를 더 포함하며, 감지부로서 비교기를 이용할 수 있다.1 is a circuit diagram of a motor power supply apparatus according to the present invention. As shown in the figure, a diode rectifying circuit 3 connected to the AC power supply 1, a resistor 12 and an overvoltage protection switching unit 14 interposed in parallel with the diode rectifying circuit 3, and a diode. A two-contact relay 11 for sequentially connecting one end of the rectifier circuit 3 to either of the both ends of the resistor 12, and a cathode connected to one end of the diode rectifier circuit 3, and the resistor 12 An overvoltage protection diode 13 in which an anode is connected to a connection contact of the overvoltage protection switching portion 14, a DC capacitor 15 interposed in parallel with the resistor 12 and the overvoltage protection switching portion 14, and a DC capacitor The inverter part 16 interposed in parallel to 15, and the control part 20 which controls the connection contact of the two-contact relay 11 are provided. Here, the motor power supply device further includes a detector (not shown) for sensing the voltage across the DC capacitor 15 and providing it to the controller 20, and may use a comparator as the detector.
본 발명에 따라 저항(12)과 2접점 릴레이(11) 및 과전압보호다이오드(13)는 돌입전류방지 및 과전압보호회로부(10)의 기능을 한다.According to the present invention, the resistor 12, the two-contact relay 11, and the overvoltage protection diode 13 function as an inrush current prevention and overvoltage protection circuit part 10.
이하에서, 모터전원공급회로의 동작원리를 서술하면 다음과 같다. 최초 전원인가시에 다이오드정류회로(3)는 릴레이(11)에 의해 저항(12)의 하측단에 마련된 제1접점(11a)에 연결되어 돌입전류방지회로로 동작한다. 따라서, 다이오드정류회로(3)의 전류는 릴레이(11)에 연결된 저항(12)을 통해 서서히 직류캐패시터(15)를 충전시킨다.Hereinafter, the operating principle of the motor power supply circuit will be described. When the power is initially applied, the diode rectifier circuit 3 is connected to the first contact 11a provided at the lower end of the resistor 12 by the relay 11 to operate as an inrush current prevention circuit. Accordingly, the current of the diode rectifying circuit 3 gradually charges the DC capacitor 15 through the resistor 12 connected to the relay 11.
충전이 완료되어 직류캐패시터(15)의 전압이 일정 전압이상이 되면, 제어부는 릴레이(11)에 제어신호를 인가하여 다이오드정류회로(3)는 릴레이(11)에 의해 저항(12)의 상측단에 마련된 제2접점(11b)에 연결되며, 정류된 입력전원은 직류캐패시터(15)에 직접 입력된다. 릴레이(11)에 연결된 저항(12)과 과전압보호다이오드(13) 및 과전압보호스위칭부(14)는 과전압보호회로로 동작한다. 과전압보호회로의 동작원리는 다음과 같다. 제어부(20)가 비교기(미도시)에 의해 직류캐패시터(15)의 양단전압(Vpn)을 감지하여 일정 전압보다 크면 직류캐패시터(15)의 과전압에 의한 전류를 저항(12)을 통해 열에너지로 소모시킨다.When the charging is completed and the voltage of the DC capacitor 15 becomes a predetermined voltage or more, the control unit applies a control signal to the relay 11 so that the diode rectifier circuit 3 is connected to the upper end of the resistor 12 by the relay 11. It is connected to the second contact (11b) provided in the rectified input power is directly input to the DC capacitor (15). The resistor 12 connected to the relay 11, the overvoltage protection diode 13, and the overvoltage protection switching unit 14 operate as an overvoltage protection circuit. The operation principle of the overvoltage protection circuit is as follows. The control unit 20 senses the voltage Vpn across the DC capacitor 15 by a comparator (not shown), and when the voltage is greater than a predetermined voltage, the controller 20 consumes the current due to the overvoltage of the DC capacitor 15 as the thermal energy through the resistor 12. Let's do it.
도 1의 구성을 갖는 모터전원공급장치에 의해 돌입전류방지 및 과전압보호를 위한 제어부의 제어순서는 아래와 같다. 도면에 도시된 바와 같이, AC전원공급부로부터 최초 전원인가되면, 다이오드정류회로(3)와 저항(12)이 직렬로 배치되도록 2접점 릴레이(11)에 제어신호를 인가하면, 저항(12)을 통해 입력되는 전류에 의해 직류캐패시터가 서서히 충전된다. 이후에, 직류캐패시터(15)가 완전히 충전된 후, 직류캐패시터(15)에 일정 과전압기준치 이상이 되면, 다이오드정류회로(3)와 저항이 병렬로 배치되도록 2접점 릴레이(11)에 제어신호를 인가하여, 저항(12)을 통해 직류캐패시터(15)에 걸린 과전압을 전달하여 에너지를 소모시킨다.The control sequence of the control unit for the inrush current prevention and the overvoltage protection by the motor power supply having the configuration of Figure 1 is as follows. As shown in the figure, when the initial power is applied from the AC power supply, when the control signal is applied to the two-contact relay 11 so that the diode rectifying circuit 3 and the resistor 12 are arranged in series, the resistor 12 is applied. The DC capacitor is slowly charged by the current input through it. Subsequently, after the DC capacitor 15 is fully charged, when the DC capacitor 15 reaches a predetermined overvoltage reference value or more, a control signal is applied to the two-contact relay 11 so that the diode rectifier circuit 3 and the resistor are arranged in parallel. When applied, the overvoltage applied to the DC capacitor 15 is transferred through the resistor 12 to consume energy.
도 2는 초기 전원공급시 도 1의 모터전원공급장치의 각 접점에서의 전압 및 전류파형도이고, 도 3은 과전압시 도 1의 모터전원공급장치의 각 접점에서의 전압 및 전류파형도이다. 이들 도면에 도시된 바와 같이, AC입력전원은 (+)와 (-)의 전압이 교대로 반복되는 사인파형이다(도3의 ??참조). AC입력전원은 다이오드정류회로(3)를 통해 정류되어 저항(12)을 통해 정류된 전원이 입력된다. 정류된 전원이 입력됨에 따라 직류캐패시터(15)에 점차 전하가 충전되어 점차 증가하는 전압곡선형태를 띤다. 그러나, 직류캐패시터(15)에 충전된 전압이 일정 과전압기준치 이상이 되면, 도 3에 도시된 바와 같이, 제어부(20)는 다이오드정류회로(3)가 제2접점에 연결되도록 2접점 릴레이(11)를 구동시키고(도3의 ??참조), 과전압보호스위칭부(14)를 온오프시킨다(도3의 ??참조). 이에 따라, 직류캐패시터(15)에 걸린 전압(Vpn)은 감소되는 형태로 표시된다(도3의 ??참조).2 is a waveform diagram of voltage and current at each contact point of the motor power supply of FIG. 1 at initial power supply, and FIG. 3 is a diagram of voltage and current waveforms at each contact point of the motor power supply of FIG. As shown in these figures, the AC input power source is a sinusoidal waveform in which voltages of (+) and (-) are alternately repeated (see FIG. 3). The AC input power is rectified through the diode rectifier circuit 3 and the rectified power is input through the resistor 12. As the rectified power is input, the DC capacitor 15 gradually charges to have a voltage curve that gradually increases. However, when the voltage charged in the DC capacitor 15 is equal to or greater than a predetermined overvoltage reference value, as shown in FIG. 3, the control unit 20 controls the two-contact relay 11 to connect the diode rectifier circuit 3 to the second contact point. ) Is turned on (see FIG. 3), and the overvoltage protection switching unit 14 is turned on and off (see FIG. 3). Accordingly, the voltage Vpn applied to the DC capacitor 15 is displayed in a reduced form (see ?? in FIG. 3).
도 4는 릴레이가 온되는 전압영역과, 과전압보호스위칭부가 턴온되는 전압영역을 도시한 그래프이다. 제어부(20)는 직류캐패시터(15)의 전압이 증가하여 릴레이구동전압(V1)에서 릴레이(11)를 온시키며, 모터로부터 전달된 에너지에 의해 과전압상한치(Vh2)에 도달하면 과전압보호스위칭부(14)를 턴온시켜 저항(12)을 통해 과전압으로 인한 에너지를 소모시킨 후 과전압하한치(Vh1)로 전압이 하강하면 다시 과전압보호스위칭부(14)를 턴오프시킨다. 이와 같이, 직류캐패시터(15)의 전압이 과전압영역(Vh1~Vh2)에 진입시마다 과전압보호스위칭부(14)를 턴온/턴오프시켜 직류캐패시터(15)의 전압을 안정화시킬 수 있다.4 is a graph illustrating a voltage region in which a relay is turned on and a voltage region in which the overvoltage protection switching unit is turned on. The control unit 20 turns on the relay 11 at the relay driving voltage V1 by increasing the voltage of the DC capacitor 15, and when the overvoltage upper limit value Vh2 is reached by the energy transmitted from the motor, the overvoltage protection switching unit ( 14) turns on and consumes energy due to the overvoltage through the resistor 12, and when the voltage drops to the overvoltage lower limit Vh1, the overvoltage protection switching unit 14 is turned off again. As such, whenever the voltage of the DC capacitor 15 enters the overvoltage regions Vh1 to Vh2, the voltage of the DC capacitor 15 may be stabilized by turning on / off the overvoltage protection switching unit 14.
이러한 구성에 의하여, 종래에는 최초 전원 인가시에만 사용되는 돌입전류 방지회로와 직류캐패시터의 충전전압이 일정 전압 이상이 될 때만 사용되는 과전압보호회로가 각각 저항을 갖도록 구현하였으나, 본 발명에 의해 단일의 저항을 공용하는 돌입전류방지회로 및 과전압보호회로를 구현함으로써, 기능에 따라 사용할 수 있도록 하여 회로설계시 부품 수, 제품 크기 및 제조단가를 줄일 수 있다.With this configuration, in the related art, the inrush current protection circuit and the overvoltage protection circuit, which are used only when the charging voltage of the DC capacitor, which is used only when the power is applied for the first time, have a resistance, respectively, are implemented according to the present invention. By implementing an inrush current prevention circuit and an overvoltage protection circuit that share a resistance, it can be used according to a function, thereby reducing the number of parts, product size, and manufacturing cost in circuit design.
이상 설명한 바와 같이, 본 발명에 따르면, 저항을 돌입방지 및 과전압보호용으로 사용가능하므로 회로설계시 부품 수 및 제조단가를 감소시킬 수 있는 모터전원공급장치 및 모터전원공급방법이 제공된다.As described above, according to the present invention, since the resistance can be used for inrush prevention and overvoltage protection, there is provided a motor power supply device and a motor power supply method that can reduce the number of components and the manufacturing cost in circuit design.
Claims (4)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2002-0069168A KR100512720B1 (en) | 2002-11-08 | 2002-11-08 | power supply apparatus for motor and controlling method thereof |
| JP2003140966A JP2004166480A (en) | 2002-11-08 | 2003-05-19 | Power feeding device and method for motor power supply |
| US10/630,837 US20040090200A1 (en) | 2002-11-08 | 2003-07-31 | Power supply apparatus for motor and control method thereof |
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| KR10-2002-0069168A KR100512720B1 (en) | 2002-11-08 | 2002-11-08 | power supply apparatus for motor and controlling method thereof |
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| KR20040041201A true KR20040041201A (en) | 2004-05-17 |
| KR100512720B1 KR100512720B1 (en) | 2005-09-07 |
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| US (1) | US20040090200A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2009044884A (en) * | 2007-08-09 | 2009-02-26 | Hitachi Kokusai Electric Inc | Overvoltage protection circuit |
| WO2009043373A1 (en) * | 2007-10-02 | 2009-04-09 | Abb Technology Ab | A drive unit for an electric motor |
| CN103560715A (en) * | 2013-11-05 | 2014-02-05 | 济南诺顿科技有限公司 | Circuit for preventing power source protection caused by overlarge motor starting surge currents |
| CN103616912B (en) * | 2013-11-23 | 2015-04-15 | 国家电网公司 | Three-winding compensation type alternating-current voltage stabilizer |
| CN103684161A (en) * | 2013-12-27 | 2014-03-26 | 南昌康富电机技术有限公司 | High-efficiency excitation generator automatic voltage regulator |
| CN103973091A (en) * | 2014-05-12 | 2014-08-06 | 江苏新瑞峰信息科技有限公司 | Circuit device with frequency converter soft start circuit and energy consumption brake circuit |
| DE102015107030A1 (en) | 2014-05-15 | 2015-11-19 | Control Techniques Ltd. | Energy bypass |
| GB2536269A (en) | 2015-03-12 | 2016-09-14 | Hamilton Sundstrand Corp | Inrush limiter for motor drive AC/AC power converters |
| CN106330002A (en) * | 2016-08-31 | 2017-01-11 | 武汉法利莱切焊系统工程有限公司 | Soft start and brake control circuit |
| WO2019051718A1 (en) * | 2017-09-14 | 2019-03-21 | 西门子公司 | Frequency converter, frequency converter assembly, and control method thereof |
| KR101896023B1 (en) * | 2017-10-27 | 2018-10-18 | 주식회사 만도 | Charging and Discharging Control Apparatus of DC Link Capacitor And The Method Thereof |
| CN110071622A (en) * | 2018-01-23 | 2019-07-30 | 西门子公司 | The multi-functional pre-charge circuit and its control device and method and frequency converter of frequency converter |
| US11956560B2 (en) | 2020-10-09 | 2024-04-09 | Meta Platforms Technologies, Llc | Digital pixel sensor having reduced quantization operation |
| US20220210360A1 (en) * | 2020-12-29 | 2022-06-30 | Facebook Technologies, Llc | Digital image sensor using a single-input comparator based quantizer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS62221897A (en) * | 1986-03-24 | 1987-09-29 | Mitsubishi Electric Corp | Motor control apparatus |
| JPH01159586U (en) * | 1988-04-19 | 1989-11-06 | ||
| IN172421B (en) * | 1989-03-14 | 1993-07-24 | Kone Elevator Gmbh | |
| JPH02142979U (en) * | 1989-04-28 | 1990-12-04 | ||
| JPH06233408A (en) * | 1993-02-02 | 1994-08-19 | Honda Motor Co Ltd | Motor feeding device for motor car |
| KR0120301B1 (en) * | 1994-12-30 | 1997-10-23 | 석진철 | Device for preventing over current of an inverter in a railcar |
| US5715155A (en) * | 1996-10-28 | 1998-02-03 | Norax Canada Inc. | Resonant switching power supply circuit |
| KR100319932B1 (en) * | 1998-10-07 | 2002-04-22 | 장병우 | Overvoltage prevention device of motor |
| KR100399135B1 (en) * | 2000-07-27 | 2003-09-26 | 삼성전자주식회사 | Microwave Oven and Control Method Thereof |
-
2002
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| JP2004166480A (en) | 2004-06-10 |
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